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Northwest Africa 13271
Basic information Name: Northwest Africa 13271
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 13271
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 20.9 g
Classification
  history:
Recommended:  LL3.15    [explanation]

This is 1 of 11 approved meteorites classified as LL3.15.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 5 Apr 2020
Writeuphelp
Writeup from MB 109:

Northwest Africa 13271 (NWA 13271)

Northwest Africa

Purchased: 2019 Aug

Classification: Ordinary chondrite (LL3.15)

History: Purchased in August 2019 by Fabien Kuntz from a meteorite dealer in Zagora.

Physical characteristics: Single stone with dark-brown fusion crust.

Petrography: (D. Sheikh, FSU) Sample is a chondrite composed of well-defined chondrules (Av. 800±50 µm) and a few dark, fine-grained inclusions (<4mm) set in a completely opaque matrix. Most chondrules preserve their primary isotropic glassy mesostasis, although some contain devitrified mesostasis.

Geochemistry: Olivine (Fa17.1±8.3, range Fa0.4-30.0, CaO wt% =0.17±0.12, n=44), Cr2O3 in ferroan olivine (0.21±0.11 wt%, range 0.06-0.39, n=30), Low-Ca Pyroxene (Fs11.5±6.1 Wo0.8±0.6, range Fs2.5-21.0 Wo0.1-2.0, n=17).

Classification: Ordinary Chondrite (LL3.15) LL group is due to average chondrule diameter and magnetic susceptibility. Subtype 3.15 is based on 1) mean Cr2O3 value and standard deviation from ferroan olivines (Grossman and Brearley, 2005), similar to Y58, 2) The presence of a completely opaque matrix and primary isotropic glassy mesostasis in most chondrules, 3) The large observed range in Fa, Fs, and in CaO content of olivines (Huss et al., 2006).

Specimens: 4.25 grams at UCLA; main mass with Fabien Kuntz.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
  • Huss, G.R., Rubin, A.E. and Grossman, J.N. (2006) Thermal Metamorphism in Chondrites. in Meteorites and the Early Solar System II, D.S. Lauretta and H.Y. McSween Jr. (eds.), University of Arizona Press, Tucson, 943 pp., 567-586. (link)
Data from:
  MB109
  Table 0
  Line 0:
Place of purchase:Zagora
Date:P 2019 Aug
Mass (g):20.9
Pieces:1
Class:LL3.15
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):17.1±8.3 (N=44)
Ferrosilite (mol%):11.5±6.1 (N=17)
Wollastonite (mol%):0.8±0.6 (N=17)
Magnetic suscept.:3.94
Classifier:D. Sheikh, FSU
Type spec mass (g):4.25
Type spec location:UCLA
Main mass:Fabien Kuntz
Comments:Submitted by Daniel Sheikh
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Kuntz: Fabien Kuntz, France; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 109, in preparation (2020)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7579 approved meteorites from (Northwest Africa) (plus 1969 unapproved names)

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